I have a MacPro3,1 from which I am hoping to eke out another year or so of life. There are two things I am in need of, improved performance and a storage strategy for migrating from eSata to Thunderbolt. I don't know if it is the existence of the nMacPro but it really seems that since upgrading to Yosemite that I've become disatisfied with performance. In particular I really like sub second response time, and I am finding more and more occassions where my MacPro is seeming sluggish. This is with the same usage pattern. One suspicion is that my use of Spaces and web browsers is bogging down my machine. My normal work flow is to have six spaces one with Mail, Calendar, Address book, others for each of safari, chrome and firefox. I tend to use all three for different purposes. Pages, Word, Excel and Numbers in other spaces. I do sometimes have to use Word and Excel. Although, I try to quit those whenever I'm not actively using them. I'm convinced they don't play well when simply idle. In terms of resources Handbrake is the only thing which will really load a lot of cores. The sluggish behaviour which I am finding trouble some is both context switches that is changing spaces or applications and most troublesome being the slow echoing of characters when typing. Note these are at times when CPU load is low, that is I'm not running Handbrake. I don't run torrents or anything that has a lot of network traffic. I'm most suspicious that after the Yosemite upgrade that memory is my big issue. Although, Activity Monitors memory usage doesn't provide me with any glaring evidence of that being an issue. Here's my configuration: MacPro3,1 - 2.8Ghz 2-CPU 8-Cores 16GB memory (8GB Apple 4x2gb modules) (8GB OWC 2x4GB) CalDigit FASTA 6GU3 2port USB3 2port eSata - used for external eSata and USB 3 drives Boot SSD - 240GB OWC Mercury EXTREME Pro 3G SSD 2.5" Serial-ATA 9.5mm Solid State Drive Internal Drives - 4 Seagate 3TB Barracuda 7200rpm configured a 2 mirrored volumes Displays: Apple 30" and 27" Cinema HD System and applications are on SSD User files are on Mirrored Volume, second Mirrored Volume Time Machine & Temp. Considering more memory and moving User files to mirrored SSD. Using OWC moving to 32GB seems affordable. While 64GB seems to expensive. I had been thinking of a OWC Mercury Accelsior_E2. However, I've been told by them that you can not mirror the two SSD blades, that is they only support Raid 0 not Raid 1. An active user partition of 500GB would capture all of my active non archival files. So Mirrored SSD might be a solution. The archival files I could push to external Raid 0+1. For performance, I've thought of more memory, and more SSD. Also newer USB 3 card. I also would consider CPU and Graphics but not sure they would get me appreciable improvement. I very rarely do video editing and the like. Only several times a year for family use. On the storage front I have a lot of loose bare drives. In excess of 100gb. I typically am using external housings with primarily eSata but some USB3 via the CalDigit card to access those. I also have iMac, Mac Mini, MacBook Pros, and MacBook Airs all of which have Thunderbolt ports. I would like to start migrating from eSata to Thunderbolt housings. It appears that the best I can do there is Thunderbolt 1 with USB 3 housings. I could then use them as USB on my MacPro and as Thunderbolt with all others. Ideally I would like to go to RAID 6 but suspect that will need to wait until I upgrade to new MacPro. On the storage front, I'm curious as to whether there is a technical reason that no one is offering eSata and Thunderbolt? That would be my preferred solution. Major reason for not upgrading to new MacPro is both price tag and performance not a significant enough jump. The last time I upgraded I went from 2005 Dual PPC MacPro to this 2008 8 Core MacPro. That seems like it was a much bigger jump in performance than what the new MacPro would provide over my current system. I guess I'm hoping the nMP will see a significant CPU bump in the next year or so. Eight 3.6ghz cores would be nice. In any event, I would appreciate any suggestions you might have to which enhancements would provide the most performance gain to my current setup as well as strategies people are using for evolving their storage toward Thunderbolt while maintaining compatibility with older MacPro.